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I need the UUID of a disk partition under Linux. The partition is mounted but does not show up under

ls -l /dev/disk/by-uuid

as can happen when duplicate UUIDs exist, for example, following emergency backup using ddrescue.

How can I find the UUID?

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The e2fsprogs package offers blkid

$ blkid
/dev/sdb1: UUID="ac115722-c8ce-44d2-ab0c-1d284d6e4d76" TYPE="ext4" 
/dev/sda2: UUID="cd6580d2-9671-4d94-b46f-0301bb563e30" TYPE="ext4" 
... 

In table format

$ blkid -o list
device     fs_type label    mount point    UUID
-------------------------------------------------------------------------------
/dev/sdb1  ext4             /mnt/dmp1      ac115722-c8ce-44d2-ab0c-1d284d6e4d76
/dev/sda2  ext4             /              cd6580d2-9671-4d94-b46f-0301bb563e30
...

For a specific device

$ blkid /dev/sdb1
/dev/sdb1: UUID="ac115722-c8ce-44d2-ab0c-1d284d6e4d76" TYPE="ext4"

Or with no extraneous information

$ blkid -s UUID -o value /dev/sdb1
ac115722-c8ce-44d2-ab0c-1d284d6e4d76

Those subsequently wanting to change UUIDs might like these answers for ordinary and LVM partitions.

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